It might seem a strange question but this is a question I answered on quora today. You can read the full answer here. However, in short, it is not simply the red wavelengths. Below you can see the light reflected by a typical red object such as an apple.

You can see that the apple reflects quite broadly between about 550 and 600nm. That includes all of the wavelengths we associate with yellow and orange as well as red. The apple even reflects nearly 10% of the light at 400nm (which we normally associate with blue) that falls upon it.

Colour is complex. You need to understand stuff way beyond the spectrum of light to understand colour.